High-Field1H MAS and15N CP-MAS NMR Studies of Alanine Tripeptides and Oligomers:  Distinction of Antiparallel and Parallel β-Sheet Structures and Two Crystallographically Independent Molecules

2007 ◽  
Vol 111 (30) ◽  
pp. 9172-9178 ◽  
Author(s):  
Yu Suzuki ◽  
Michi Okonogi ◽  
Kazuo Yamauchi ◽  
Hiromichi Kurosu ◽  
Masataka Tansho ◽  
...  
Keyword(s):  
Mas Nmr ◽  
Nmr Studies ◽  
Independent Molecules ◽  
Cp Mas Nmr ◽  
Β Sheet

13C solid state CP/MAS NMR studies of EDTA complexes

1987 ◽  
Vol 129 (2) ◽  
pp. L23-L25 ◽  
Author(s):  
Silvio Aime ◽  
Roberto Gobetto ◽  
Rita Nano ◽  
Enrica Santucci
Keyword(s):  
Solid State ◽  
Mas Nmr ◽  
Nmr Studies ◽  
Edta Complexes ◽  
Cp Mas Nmr

XRD, FTIR and 13C CP/MAS NMR Studies of Composite Comprising Poly(vinyl acetate)-Silylated Si-MCM-41

2011 ◽  
Vol 364 ◽  
pp. 159-163
Author(s):  
Izza Taib Nurul ◽  
Salasiah Endud ◽  
M. Nasir Katun
Keyword(s):  
Carbonyl Group ◽  
Vinyl Acetate ◽  
Silica Matrix ◽  
Mas Nmr ◽  
Polymer Chains ◽  
Confined Space ◽  
Nmr Studies ◽  
Solution Intercalation ◽  
Cp Mas Nmr ◽  
Mcm 41

A composite structure based on silylated MCM-41 and Poly (vinyl acetate) (PVAc) was synthesized via solution intercalation. Poly (vinyl acetate)-silylated Si-MCM-41 composite were characterized by XRD, FTIR spectroscopy and13C CP/MAS NMR in order to determine the compatibility between PVAc and the silicate host. XRD study reveals that the framework of silylated Si-MCM-41 was not altered upon incorporation of PVAc. FTIR study showed that characteristic peak assigned to carbonyl group in PVAc was observed around 1741.6 cm-1for all the composites indicating the presence of PVAc in the silylated Si-MCM-41.13C CP/MAS NMR showed the increase of line width of the peak assigned to C=O carbonyl group indicating the increase in randomness of polymer chains in confined space. The shifting of the C=O carbonyl groups is a sign of the change in chemical environment of the carbonyl owing to the interaction of PVAc with the silica matrix of silylated Si-MCM-41.

Multinuclear Solid-State MAS/CP-MAS NMR Studies of Promoter (Phosphate)-Enhanced Crystallization of Siliceous MCM-41

2003 ◽  
Vol 107 (51) ◽  
pp. 14171-14175 ◽  
Author(s):  
S. C. Laha ◽  
M. D. Kadgaonkar ◽  
A. Anuji ◽  
S. Ganapathy ◽  
J. P. Amoureux ◽  
...  
Keyword(s):  
Solid State ◽  
Mas Nmr ◽  
Nmr Studies ◽  
Cp Mas Nmr ◽  
Mcm 41

Polymer-supported ferrocene derivatives. Some13C CP MAS NMR studies and use as hydrogenation catalysts

1988 ◽  
Vol 2 (3) ◽  
pp. 263-275 ◽  
Author(s):  
Ian R Butler ◽  
William R Cullen ◽  
Nam Fong Han ◽  
F Geoffrey Herring ◽  
N R Jagannathan ◽  
...  
Keyword(s):  
Mas Nmr ◽  
Ferrocene Derivatives ◽  
Nmr Studies ◽  
Hydrogenation Catalysts ◽  
Polymer Supported ◽  
Cp Mas Nmr
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